Hi,
I was interested in how much of our community is active in the wiki to get in touch with the more experienced users.
Like this graph shows you

-2367 Users were active during the past 3 month (that is ~43% of all active OSM users)
-71% of this number did less than 10 edits
-97% did less than 100 edits
-only 35 users did over 150 edits

So on the one hand I was suprised that so much people do edits, on the other hand it is clear that only a few dozen people make bigger updates to the pages or the wiki structure as a whole.
But this is what caused the wiki to be as suboptimal that it is currently :( Similar to OSM a wiki makes only sense when it is updated by the masses and so it is lifely.

This is the reason we founded the wiki team, that will assisting you on complicated edits, refactoring structures and more. Cause in history only a few ones cleaned up the wiki alone. Now we can work together on bigger tasks and can provide each other feedback on design decissions. But don't forget, this is a lonely job somewhere in the backstage of OSM ;)
http://wiki.openstreetmap.org/wiki/Wikiteam

So roll up your sleeves and help the community by small wiki task as:
*fixing typos
*updating content
*categorize lost pages
*labeling pages as {{OutOfDate}}, {{Cleanup}} or {{Stub}}

The problem with updating wiki content, is that those who see themselves as owners of particular pages can very quickly revert changes as being not agreed/voted upon, which then I suspect would put off useers who haven't got a high number of wiki edits from doing any more.